Carlos Berlocq beat Horacio Zeballos 6-4, 6-3 in an all-Argentine match in the first round of the Swedish Open on Monday.
Berlocq broke Zeballos' serve three times.
Earlier Monday, Bulgaria's Grigor Dimitrov was put to the test by 17-year-old Elias Ymer of Sweden, rallying to win 5-7, 6-2, 6-4.
Argentina's Martin Alund also prevailed in a close match against Sweden's Markus Erikson, winning 7-5, 6-7 (5), 7-6 (8) to advance to the second round of the clay-court tournament in Bastad.

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